Supplement analysis backed by scientific evidence · PT

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Strong evidenceHeart & metabolic

Plant Sterols

Plant sterols and stanols reliably lower LDL cholesterol by about 8-12% at 2 g/day — one of the best-established non-drug lipid interventions. What is missing is direct proof that this translates into fewer heart attacks.

What the science says

  • Lowers LDL cholesterol dose-dependently Strong evidence

    A meta-analysis of 124 randomised controlled studies found a continuous dose-response: roughly 6% LDL reduction at 1 g/day, 9-10% at 2 g/day, and about 12% at 3 g/day, with the curve flattening beyond 3 g/day. The mechanism is competitive inhibition of intestinal cholesterol absorption, so it is additive to statins, which act on synthesis.

  • Adds to statin therapy Moderate evidence

    Adding 2 g/day of sterols or stanols to an existing statin produces a further LDL reduction of roughly 6-10% — comparable to doubling the statin dose, which typically yields only about 6%. The European Atherosclerosis Society consensus endorses this as a reasonable adjunct when LDL targets are not met.

  • Prevents cardiovascular events Limited evidence

    No trial has been powered for hard endpoints such as myocardial infarction or cardiovascular death. Benefit is inferred from the LDL reduction. Complicating this, people with the rare genetic condition sitosterolaemia — who absorb plant sterols excessively — develop premature atherosclerosis, and observational data on circulating sterol levels are mixed.

  • Modestly lowers fat-soluble vitamins Moderate evidence

    Regular use reduces plasma carotenoids, particularly beta-carotene, by roughly 10-20%. This is usually offset by eating a daily serving of carotenoid-rich vegetables or fruit, and no clinical harm has been demonstrated.

Dosage & safety

Studied dose1.5-3 g/day of plant sterol or stanol esters, taken with meals — absorption inhibition requires the sterols to be present alongside dietary cholesterol, so taking them between meals wastes most of the effect. Splitting across two meals works as well as a single dose. Enriched spreads, yoghurt drinks and capsules all work provided the dose is delivered with food. Beyond 3 g/day there is little added LDL benefit. Effects appear within 2-3 weeks and reverse within weeks of stopping.
SafetyVery well tolerated; mild gastrointestinal upset is the main complaint. Absolutely contraindicated in sitosterolaemia (phytosterolaemia), a rare inherited disorder in which plant sterol absorption is grossly elevated. Not recommended for children under 5 or during pregnancy and breastfeeding, since cholesterol is needed for growth and no benefit has been shown in these groups. Expect a drop in blood carotenoids — eat carotenoid-rich foods daily. Sterols do not replace statins in people with established cardiovascular disease or high absolute risk.

Scientific references

Where to buy

Vitacost, Pygeum & Plant Sterols, 60 Capsules

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